novas_searay215ExpCrus
New Member
- Sep 16, 2022
- 12
- Boat Info
- 1999 Sea Ray Express Cruiser 215, Mercruiser EFI, Closed Cooling system, Alpha 1 Stern Drive
- Engines
- Mercruiser 5.0 EFI Alpha 1 Stern Drive
I bought a 1999 Sea Ray Express Cruise with the Mercruiser 5.0 EFI. It has a closed cooling system. I have been working on it for a while and changed the zincs, impeller, oil, and water separator filter. Topped off the radiator fluid. I hooked the water hose up to the stern drive seems to be sucking water up into the engine to cool the coolant. Yet the boat temp climbs over about 4 minutes to 200 degrees the alarm goes off and I shut the engine off. I put the boat in the lake and it did the same thing. So now, of course, I think the thermostat is bad and I pull the thermostat out, along with the housing and the inside of the housing for the thermostat is full of white corrosion build up. I have cleaned that out, but how do I clean the debris from the corrosion out of the rest of the cooling system?
The engine sounds amazing, so the issue hasn't spread.
The engine sounds amazing, so the issue hasn't spread.